/Engine/Source/Runtime/Engine/Classes/GameFramework/RootMotionSource.h
Copy operator - deep copy so it can be used for archiving/saving off moves
[FRootMotionSourceGroup](API\Runtime\Engine\GameFramework\FRootMotionSourceGroup) & operator= ( const [FRootMotionSourceGroup](API\Runtime\Engine\GameFramework\FRootMotionSourceGroup) & Other )